Ester of (triarylphosphoranylidene)carbamic acid having diuretic and ability to lower plasma renin properties

ABSTRACT

Novel triarylphosphinimide derivatives having the formula ##STR1## wherein R 1 , R 2  and R 3  are each at the ortho or meta position, represent mono- or disubstituents and are selected from the group consisting of hydrogen, alkyl(C 1  -C 3 ), alkoxy(C 1  -C 3 ), trifluoromethyl and halogen; and R 4  is selected from the group consisting of alkyl(C 1  -C 3 ), alkenyl(C 2  -C 3 ), alkynyl(C 2  -C 4 ), cycloalkyl(C 3  -C 5 ), cycloalkyl(C 3  -C 6 )methyl, 4-oxopentyl, 3-tetrahydrofuranyl, 2,3-dihydro-1H-inden-1-yl, 1-alkyl(C 1  -C 3 )cyclopentyl, trans-2-alkyl(C 1  -C 3 )cyclopentyl, trans-2-alkoxy(C 1  -C 3 )cyclopentyl, 1-cyclopropylethyl, 2-methylcyclopropylmethyl, dicyclopropylmethyl, 2-, 3- or 4-pyridinylmethyl, 2-cyclopenten-1-yl, tetrahydro-2H-pyran-4-yl and cis and trans-2-methoxycyclohexyl; with the proviso that when R 4  is alkyl(C 1  -C 3 ), R 1 , R 2  and R 3  may not each be hydrogen ##STR2## wherein R 1 , R 2  and R 3  are each at the ortho or meta position and are selected from hydrogen and alkyl(C 1  -C 3 ), and X is an acid addition salt; processes for producing them, compositions containing them, and methods for using them in mammals to effect diuresis; to lower plasma renin levels and to increase cardiac contractility.

SUMMARY OF THE INVENTION

This invention is concerned with new compounds of the formula: ##STR3## wherein R₁, R₂ and R₃ are each at the ortho or meta position, represent mono- or disubstituents and are selected from the group consisting of hydrogen, alkyl(C₁ -C₃), alkoxy(C₁ -C₃), trifluoromethyl and halogen; and R₄ is selected from the group consisting of alkyl(C₁ -C₃), alkenyl(C₂ -C₃), alkynyl(C₂ -C₄), cycloalkyl(C₃ -C₅), cycloalkyl(C₃ -C₆)methyl, 4-oxopentyl, 3-tetrahydrofuranyl, 2,3-dihydro-1H-inden-1-yl, 1-alkyl(C₁ -C₃)cyclopentyl, trans-2-alkyl(C₁ -C₃)cyclopentyl, trans-2-alkoxy(C₁ -C₃)cyclopentyl, 1-cyclopropylethyl, 2-methylcyclopropylmethyl, dicyclopropylmethyl, 2-, 3- or 4-pyridinylmethyl, 2-cyclopenten-1-yl, tetrahydro-2H-pyran-4-yl and cis and trans-2-methoxycyclohexyl; with the proviso that when R₄ is alkyl(C₁ -C₃), two of R₁, R₂ and R₃ are not hydrogen.

East German Pat. No. 137,716 covers a process for preparing N-substituted triorganophosphine imines which are stated to possess undisclosed biological utility. That patent discloses compounds of the above formula where R₁, R₂ and R₃ are all hydrogen and R₄ is alkyl. Therefore, the proviso for R₄ eliminates these compounds from the generic formula of this invention. The method of treatment and composition of matter aspects of this invention include these compounds, however.

R₄ is preferably methyl, ethyl, 2-, 3-, or 4-pyridinylmethyl, 3-tetrahydrofuranyl or cyclopropylmethyl. In one preferred embodiment, R₁ is 2-methyl, 2-ethyl, 2-chloro, 2-bromo, 2-fluoro or 2-trifluoromethyl and R₂ and R₃ are both hydrogen. In a second preferred embodiment R₁ and R₂ are the same and are 2-methyl or 2-chloro and R₃ is hydrogen. In another preferred embodiment R₁ is 3-chloro and R₂ and R₃ are both hydrogen.

This invention is also concerned with new compounds of the formula: ##STR4## wherein R₁, R₂ and R₃ are each at the ortho or meta position and are hydrogen or alkyl(C₁ -C₃); and X is an acid-addition salt such as sulfuric.

This invention is also concerned with a method for effecting diuresis and lowering plasma renin activity in mammals as well as pharmaceutical compositions of matter containing these compounds and with processes for the preparation of these compounds.

DETAILED DESCRIPTION OF THE INVENTION

In accordance with the present invention, there is provided a novel means of effecting diuresis, lowering plasma renin activity and increasing cardiac contractility in a mammal which comprises administering to said mammal a therapeutically effective amount of a compound selected from those of the above described Formula I.

The compounds of Formula I find utility as diuretics and cardiotonics in mammals and as such may be used as the drug of choice for the treatment of edema caused by cardiac, hepatic, pulmonary and renal diseases, as well as drug-induced fluid and salt retention. These compounds may also be useful as hypotensive agents upon chronic administration by virtue of their diuretic activity. As cardiotonic agents, these compounds may likewise be useful in the treatment of congestive heart failure.

Renin is a proteolytic enzyme which converts plasma angiotensinogen to angiotensin I. Angiotensin I, in turn is, enzymatically converted to angiotensin II, which constricts blood vessels and stimulates aldosterone production by the adrenal cortex, and latter leading to increased renal sodium retention and potassium excretion and expansion of extracellular volume.

The action of the currently available diuretics can be depicted by the following diagram: ##STR5##

In contrast, the compounds of the present invention acting on the kidney lower plasma renin activity, thereby effecting non-attenuated sodium loss and minimal potassium loss mediated in part by lack of adrenal compensatory aldosterine release. ##STR6##

The compounds of this invention may be prepared as described in the following flowcharts and text. ##STR7##

In accordance with Flowchart A, an alcohol (1), where R₄ is alkyl(C₁ -C₃), 2-propenyl or tetrahydro-3-furanyl, is reacted with a small portion of sodium hydride in dry acetonitrile until gas evolution ceases and then with carbonyldiimidazole (2) for 2-6 hours, giving the compounds (3), which are then reacted with hydrazine in acetonitrile for 8-24 hours at room temperature and evaporated to dryness, giving the hydrazine derivatives (4) which are then dissolved in a mixture of water and hydrochloric acid, cooled to 0°-5° C. and reacted with sodium nitrite, then extracted into ether as the azide derivatives (5) and finally reacted with a substituted triaryl phosphine, where R₁, R₂ and R₃ are as described above, in ether for 1-4 hours at room temperature, giving the products (6), where R₄ is as described above. ##STR8##

In accordance with Flowchart B, an alcohol (1), where R₄ is alkyl(C₁ -C₃), 2-propenyl or tetrahydro-3-furanyl, is reacted with phosgene to give the compounds (7) which may then either be reacted with hydrazine to give (4) and then with sodium nitrite to give (5), or may be reacted with sodium or lithium azide in acetonitrile to give (5) directly, followed by conversion to the products (6) as described in Flowchart A. ##STR9##

In accordance with Flowchart C, a P,P,P-triphenylphosphine imide sulfate (8), where R₁, R₂ and R₃ are a described above, and triethylamine in tetrahydrofuran reacted with carbonyldiimidazole (2), giving an N-(triphenylphosphoranylidene)-1H-imidazole-1-carboxamide (9) which is then reacted with an alcohol (1), where R₄ is as described above, and sodium hydride in 1,2-dimethoxyethane, giving the products (10). ##STR10##

In accordance with Flowchart D a phosphine (11), where R₁, R₂ and R₃ are as described above, is reacted with a carbonazidate (5), where R₄ is as described above, in ether, giving the products (10). ##STR11##

In accordance with flowchart E, (the process of preparing phosphinimides described in "Houben-Weyl Methoden der Organischen Chemie", 4th Edition, Phosphor Verbindungen II, M. Regitz, ed.) a substituted triaryl phosphine, where R₁, R₂ and R₃ are each at the ortho or meta position and are hydrogen or alkyl(C₁ -C₃) is reacted with O-hydroxylaminesulfonic acid in methanol, giving the phosphinimide sulfate salt. The sulfates may be easily converted to other acid-addition salts by simple chemistry.

It is generally preferred that the respective product of each process step described in the above reaction schemes be separated and/or isolated prior to its use as starting material for subsequent steps. Separation and isolation can be effected by any suitable purification procedure such as evaporation, crystallization, column chromatography, distillation, etc. Also it should be appreciated that reaction times, temperatures and mole ratios are within the skill of the art.

Lowering of Plasma Renin Activity in Normal Conscious Rats

Compounds were tested for their ability to lower plasma renin activity of conscious, male Wistar rats (180-200 g, Charles River Labs.). Test agents were compounded in a mortar and pestle with 3% preboiled starch suspension. Rats were dosed orally by gavage with 25 mg/kg test agent in a dose volume of 2 ml/kg. At time zero and 1/3, 1, 3 and 6 hours relative to dosing, rats were sacrificed by decapitation and the first 3 seconds of blood collected in two chilled Vacutainer® tubes (Becton-Dickinson, Rutherford, N.J.) containing 40 μl of 150 mg/ml tripotassium EDTA. Plasma fractions, obtained by centrifugation for 20 minutes at 4° C. and 3000 G, were incubated (one of each pair at 37° C., the other at 4° C.) at pH 6.8 in 50 mM phosphate buffer to produce angiotensin I. The incubates contained peptidase inhibitors to prevent angiotensin I degradation and the buffer contained one mg/ml lysozyme (Sigma Grade III) used as an antiabsorbant. The incubates were diluted 20 fold in cold Tris buffer (pH adjusted to 7.4 with glacial acetic acid) also containing one mg/ml lysozyme, and then frozen. Diluted incubates were assayed within 3 days for angiotensin I content by radioimmunoassay according to a modification of the method of Haber, et al., J. Clin. Endocrin., 29, 1349-1355 (1969). Renin activity is calculated as the rate of production of angiotensin I (nanograms of angiotensin I/ml plasma/hour at 37° C.) less controls (rate at 4° C.). The results of this test on a representative compound of this invention appear in Table I.

                  TABLE I                                                          ______________________________________                                         Percent Lowering of Plasma Renin Activity in Normal                            Concious Rats at Various Time Intervals Following                              Administration of a Single 25 mg/kg Oral Dose of                               (Triphenylphosphoranylidene)carbamic Acid, Ethly Ester                         Hours After Dose                                                                               No. of Rats                                                                              % Lowering                                           ______________________________________                                         0               6          0                                                   1/3             6         38                                                   1               6         74                                                   3               6         59                                                   6               6         40                                                   ______________________________________                                    

Inhibition of evoked increase of plasma renin activity was determined by the following test.

Compounds were tested for their ability to prevent drug-induced elevation of plasma renin activity (PRA) in concious, male Wistar rats (180-200 g, Charles River Lab.). PRA elevation was induced by a combined oral provacative treatment (C) of hydrochlorothiazide (10 mg/kg) and 1-(3-benzoyl-3-mercapto-2-methylpropionyl)-L-proline, acetate (U.S. Pat. No. 4,226,775) (one mg/kg), prepared by compounding in a mortar and pestle with preboiled 3% starch suspension. This treatment provided the daily maximum PRA. The daily minimum PRA was obtained from rats given oral starch suspension (S) alone. The magnitude of drug effect on PRA elevation was ascertained from rats pretreated orally with test agent (D), at the indicated doses, 30 minutes prior to administration of provacative treatment (C). The test agent was also compounded in preboiled 3% starch suspension. The dose volumes for both pretreatment and provocative treatment were 2 ml/kg. One hour after provocative treatment the rats were sacrificed by decapitation and the first 3 seconds of blood collected in two chilled Vacutainer® tubes (Becton-Dickinson, Rutherford, N.J.) containing 40 μl of 150 mg/ml tripotassium EDTA. The plasma fractions, obtained by centrifugation for 20 minutes at 4° C. and 3000 G, were incubated (one of each pair at 37° C., the other at 4° C.) at pH 6.8 in 50 mM phosphate buffer to produce angiotensin I. The incubates contained peptidase inhibitors to prevent angiotensin I degradation and the incubation buffer contained one mg/ml lysozyme (Sigma Grade III) used as an antiabsorbant. The incubates were diluted 20 fold in cold 100 mM Tris buffer (pH adjusted to 7.4 with glacial acetic acid) also containing one mg/ml lysozyme, and then frozen. Diluted incubates were assayed within 3 days for angiotensin I content by radioimmunoassay according to a modification of the method of Haber, et al., J. Clin. Endocrin., 29, 1349-1355 (1969).

PRA is calculated as follows:

    PRA(ng AI/hour/ml plasma)=PRA 37° C.-PRA 4° C.

Percent inhibition of PRA elevation is calculated as follows: ##EQU1##

The results of this test on representative compounds of this invention appear in Table II.

                  TABLE II                                                         ______________________________________                                         Percent Inhibition of Plasma Renin Elevation                                                               Average %                                                             Dose     Inhibition                                         Compound           (mg/kg)  (No. of Rats)                                      ______________________________________                                         (Triphenylphosphoranylidene)-                                                                     25        80 (14)                                           carbamic acid, ethyl ester                                                                        15       79 (6)                                                                10       81 (6)                                                                7        46 (5)                                                                5        29 (5)                                                                3        22 (5)                                             (Triphenylphosphoranylidene)-                                                                     25       72 (3)                                             carbamic acid, methyl ester                                                    (Triphenylphosphoranylidene)-                                                                     25       90 (3)                                             carbamic acid, propyl ester                                                    (Triphenylphosphoranylidene)-                                                                     100      85 (8)                                             carbamic acid, tetrahydro-3-                                                                      50       49 (8)                                             furanyl ester      25       69 (5)                                             (Triphenylphosphoranylidene)-                                                                     25       67 (3)                                             carbamic acid 2-propenyl                                                       ester                                                                          [(2-Methylphenyl)diphenyl-                                                                        25       92 (3)                                             phosphoranylidene]carbamic                                                     acid, ethyl ester                                                              (Triphenylphosphoranylidene)-                                                                     25       40 (3)                                             carbamic acid, 3-pyridinyl-                                                    methyl ester                                                                   [(2-Methylphenyl)diphenyl-                                                                        25       93 (3)                                             phosphoranylidene]carbamic                                                     acid, tetrahydro-3-furanyl                                                     ester                                                                          [Bis(2-methylphenyl)phenyl-                                                                       25       54 (3)                                             phosphoranylidene]carbamic                                                     acid, ethyl ester                                                              [(2-Methylphenyl)diphenyl-                                                                        25       75 (3)                                             phosphoranylidene]carbamic                                                     acid, 3-pyridinylmethyl ester                                                  [Diphenyl[2-(trifluoromethyl)-                                                                    25       75 (3)                                             phenyl]phosphoranylidene]-                                                     carbamic acid, ethyl ester                                                     [(2-Methylphenyl)diphenyl-                                                                        25       72 (3)                                             phosphoranylidene]carbamic                                                     acid, cyclopropylmethyl ester                                                  [(2-Chlorophenyl)diphenyl-                                                                        25       96 (3)                                             phosphoranylidene]carbamic                                                     acid, ethyl ester                                                              [(2,6-Dimethylphenyl)diphenyl-                                                                    25       68 (3)                                             phosphoranylidene]carbamic                                                     acid, methyl ester                                                             [(2-Chlorophenyl)diphenyl-                                                                        25       98 (3)                                             phosphoranylidene]carbamic                                                     acid, methyl ester                                                             [ Diphenyl[2-(trifluoromethyl)-                                                                   25       49 (2)                                             phenyl]phosphoranylidene]-                                                     carbamic acid, methyl ester                                                    ______________________________________                                    

The diuretic activity of the compounds of this invention was also determined according to the method of Chan, P. S. and Poorvin, D., Sequential method for combined screening antihypertensive and diuretic agents in the same spontaneously hypertensive rat. Clinical and Experimental Hypertension, 1(6), 817-830 (1979).

Male spontaneously hypertensive rats (SHR) of Okamoto strain, 16 weeks old, Taconic Farms Inc. were used in the test. These rats were kept on Purina laboratory chow and tap water ad libitum for 8 weeks before use. One male adult rat (about 300 g) was dosed by gavage with a test compound at 100 mg/kg together with 0.9% sodium chloride loading at 25 ml/kg at zero hour. The test compound was suspended in 3% preboiled starch at 50 mg/ml. The rat was put in a metabolism cage. The 0-5 hour urine was collected and urinary sodium and potassium were determined using a Beckman Astra 4. The effects of representative compounds of the invention according to this test appear in Table III expressed in milliequivalents (mEQ) of urinary sodium and potassium excreted.

                  TABLE III                                                        ______________________________________                                         Diuretic Activity in Spontaneously Hypertensive Rats                                          Vol-                Potassium                                                  ume     Sodium      mEQ/5                                       Compound       ml      mEQ/5 Hours Hours                                       ______________________________________                                         (Triphenylphosphoranyli-                                                                      15.5    1.86        0.50                                        dene)carbamic acid,                                                            ethyl ester                                                                    (Triphenylphosphoranyli-                                                                      23.3    2.53        0.55                                        dene)carbamic acid,                                                            methyl ester                                                                   (Triphenylphosphoranyli-                                                                      12.5    1.37        0.48                                        dene)carbamic acid,  -n-                                                       propyl ester                                                                   (Triphenylphosphoranyli-                                                                      14.8    1.10        0.70                                        dene)carbamic acid, tet-                                                       rahydro-3-furanyl ester                                                        (Triphenylphosphoranyli-                                                                      13.3    1.17        0.67                                        dene)carbamic acid, 2-                                                         propenyl ester                                                                 (Triphenylphosphoranyli-                                                                      13.3    1.16        0.58                                        dene)carbamic acid, 4-                                                         oxopentyl ester                                                                (Triphenylphosphoranyli-                                                                      14.5    1.47        0.60                                        dene)carbamic acid,                                                            cyclobutylmethyl ester                                                         (Triphenylphosphoranyli-                                                                      13.0    1.41        0.87                                        dene)carbamic acid, 2,3-                                                       dihydro-1 .sub.--H--inden-1-yl                                                 ester                                                                          (Triphenylphosphoranyli-                                                                      14.8    1.49        0.86                                        dene)carbamic acid, 1-                                                         methylcyclopentyl ester                                                        (Triphenylphosphoranyli-                                                                      14.3    1.55        0.68                                        dene)carbamic acid,                                                            trans-methylcyclopentyl                                                        ester                                                                          (Triphenylphosphoranyli-                                                                      15.5    1.76        0.58                                        dene)carbamic acid, 2-                                                         propynyl ester                                                                 (Triphenylphosphoranyli-                                                                      12.5    1.34        1.01                                        dene)carbamic acid,                                                            1-ethylcyclopentyl ester                                                       (Triphenylphosphoranyli-                                                                      19.5    2.00        0.57                                        dene)carbamic acid,                                                            cyclopropylmethyl ester                                                        (Triphenylphosphoranyli-                                                                      17.0    1.83        0.72                                        dene)carbamic acid,                                                            trans-2-methoxycyclo-                                                          pentyl ester                                                                   (Triphenylphosphoranyli-                                                                      10.0    1.15        0.57                                        dene)carbamic acid,                                                            2-butynyl ester                                                                [(2-Methylphenyl)diphen-                                                                      25.5    2.68        0.78                                        ylphosphoranylidene]car-                                                       bamic acid, ethyl ester                                                        [(2-Methoxyphenyl)di-                                                                         11.3    1.31        0.97                                        phenylphosphoranyli-                                                           dene]carbamic acid,                                                            ethyl ester                                                                    (Triphenylphosphoranyli-                                                                      12.0    1.19        0.65                                        dene)carbamic acid, 1-                                                         cyclopropylethyl ester                                                         (Triphenylphosphoranyli-                                                                      14.0    1.25        0.82                                        dene)carbamic acid, 2-                                                         pyridinylmethyl ester                                                          (Triphenylphosphoranyli-                                                                      15.5    1.58        0.83                                        dene)carbamic acid, 2-                                                         cyclopenten-1-yl ester                                                         ester                                                                          (Triphenylphosphoranyli-                                                                      13.3    1.38        0.73                                        dene)carbamic acid,                                                            trans-2-ethoxycyclopentyl                                                      ester                                                                          (Triphenylphosphoranyli-                                                                      16.5    1.50        0.70                                        dene)carbamic acid, 4-                                                         pyridinylmethyl ester                                                          (Triphenylphosphoranyli-                                                                      10.3    1.14        0.63                                        dene)carbamic acid, 1-                                                         propylcyclopentyl ester                                                        (Triphenylphosphoranyli-                                                                      14.5    1.60        1.00                                        dene)carbamic acid, 2-                                                         pyridinylmethyl ester                                                          (Triphenylphosphoranyli-                                                                      11.3    1.28        0.47                                        dene)carbamic acid, (2-                                                        methylcyclopropyl)methyl                                                       ester                                                                          (Triphenylphosphoranyli-                                                                      15.3    1.60        0.64                                        dene)carbamic acid,                                                            tetrahydro-2 .sub.--H--pyran-4-yl                                              ester                                                                          [(2-Methylphenyl)diphen-                                                                      22.3    2.71        0.97                                        ylphosphoranylidene]car-                                                       bamic acid, tetrahydro-                                                        3-furanyl ester                                                                (Triphenylphosphoranyli-                                                                      11.3    1.15        0.59                                        dene)carbamic acid, cis                                                        and trans-2-methoxycy-                                                         clohexyl ester                                                                 (Triphenylphosphoranyli-                                                                      12.8    1.45        0.67                                        dene)carbamic acid,                                                            trans-2-methoxycyclo-                                                          hexyl ester                                                                    (Triphenylphosphoranyli-                                                                      14.3    1.58        1.07                                        dene)carbamic acid,                                                            dicyclopropylmethyl                                                            ester                                                                          [Bis(2-methylphenyl)-                                                                         14.5    1.46        0.73                                        phenylphosphoranyli-                                                           dene]carbamic acid,                                                            ethyl ester                                                                    [(2-Methylphenyl)diphen-                                                                      12.3    1.48        0.62                                        ylphosphoranylidene]car-                                                       bamic acid, 3-pyridinyl-                                                       methyl ester                                                                   [Diphenyl[2-(trifluoro-                                                                       19.3    2.12        0.91                                        methyl)phenyl]phosphor-                                                        anylidene]carbamic acid,                                                       ethyl ester                                                                    [(2-Methylphenyl)diphen-                                                                      12.0    1.33        0.73                                        ylphosphoranylidene]car-                                                       bamic acid, cyclopropyl-                                                       methyl ester                                                                   [(2-Chlorophenyl)diphen-                                                                      19.5    2.05        0.71                                        ylphosphoranylidene]car-                                                       bamic acid, ethyl ester                                                        [(2-Methylphenyl)diphen-                                                                      10.8    1.18        0.67                                        ylphosphoranylidene]car-                                                       bamic acid, cyclopentyl                                                        ester                                                                          [[(2,6-Dimethylphenyl)-                                                                       13.0    1.48        0.86                                        diphenyl]phosphoranyli-                                                        dene]carbamic acid,                                                            ethyl ester                                                                    [(2-Ethylphenyl)diphen-                                                                       19.0    2.07        0.78                                        ylphosphoranyidene]car-                                                        bamic acid, ethyl ester                                                        [(2-Methylphenyl)diphen-                                                                      18.3    1.95        0.88                                        ylphosphoranylidene]car-                                                       bamic acid, methyl ester                                                       [(2,6-Dimethylphenyl)-                                                                        12.8    1.33        0.84                                        diphenylphosphoranyli-                                                         dene]carbamic acid,                                                            methyl ester                                                                   [(2-Chlorophenyl)diphen-                                                                      20.0    2.30        0.94                                        ylphosphoranylidene]car-                                                       bamic acid, methyl ester                                                       [Diphenyl[2-(trifluoro-                                                                       18.5    1.71        1.02                                        methyl)phenyl]phosphor-                                                        anylidene]carbamic acid,                                                       methyl ester                                                                   [Diphenyl[2-(trifluoro-                                                                       16.3    1.64        0.63                                        methyl)phenyl]phosphor-                                                        anylidene]carbamic acid,                                                       tetrahydro-3-furanyl                                                           ester                                                                          [(2-Chlorophenyl)diphen-                                                                      20.0    1.90        0.68                                        ylphosphoranylidene]car-                                                       bamic acid, tetrahydro-                                                        3-furanyl ester                                                                [Bis(2-methylphenyl)-                                                                         13.5    1.45        0.76                                        phenylphosphoranyli-                                                           dene]carbamic acid,                                                            methyl ester                                                                   [(2-Ethylphenyl)diphen-                                                                       14.3    1.36        0.58                                        ylphosphoranylidene]car-                                                       bamic acid, methyl ester                                                       [(3-Chlorophenyl)diphen-                                                                      23.8    2.32        0.64                                        ylphosphoranylidene]car-                                                       bamic acid, ethyl ester                                                        [(3-Chlorophenyl)diphen-                                                                      23.0    2.45        0.60                                        ylphosphoranylidene]car-                                                       bamic acid, methyl ester                                                       [Bis(2-chlorophenyl)-                                                                         22.3    2.40        0.38                                        phenylphosphoranyli-                                                           dene]carbamic acid,                                                            ethyl ester                                                                    (Triphenylphosphoranyli-                                                                      14.0    1.48        0.80                                        dene)carbamic acid,                                                            cyclopentyl ester                                                              [(2-Bromophenyl)diphenyl-                                                                     22.5    2.51        0.68                                        phosphoranylidene]car-                                                         bamic acid, ethyl ester                                                        [(3-Trifluoromethylphen-                                                                      13.5    1.38        0.67                                        yl)phosphoranylidene]-                                                         carbamic acid, ethyl                                                           ester                                                                          [bis(3-Chlorophenyl)-                                                                         18.3    1.84        0.89                                        phenylphosphoranylidene]-                                                      carbamic acid, ethyl                                                           ester                                                                          [(3-Fluorophenyl)diphen-                                                                      24.0    2.44        0.62                                        ylphosphoranylidene]car-                                                       bamic acid, ethyl ester                                                        [ (2,3-Dichlorophenyl)-                                                                       14.3    1.83        0.86                                        diphenylphosphoranyli-                                                         dene]carbamic acid ethyl                                                       ester                                                                          [Bis(2-methylphenyl)-                                                                         13.5    1.45        0.76                                        phenylphosphoranyl-                                                            idene]carbamic acid,                                                           methyl ester                                                                   [Diphenyl(2-fluoro-                                                                           19.8    2.01        0.66                                        phenyl)phosphoranyli-                                                          dene]carbamic acid,                                                            ethyl ester                                                                    [[2-(1-Methylethyl)-                                                                          18.8    2.08        0.83                                        phenyl]diphenyl-                                                               phosphoranylidene]-                                                            carbamic acid, ethyl                                                           ester                                                                          [(3-Bromophenyl)-                                                                             12.4    1.16        0.78                                        diphenylphosphoranyli-                                                         dene]carbamic acid,                                                            ethyl ester                                                                    (Triphenylphosphoran-                                                                         14.5    1.60        1.00                                        ylidene)carbamic acid,                                                         3-pyridinylmethyl ester                                                        (2-Methylphenyl)di-                                                                           16.3    1.88        0.68                                        phenylphosphinimide                                                            sulfate                                                                        Triphenylphosphinimide                                                                        12.0    1.25        0.65                                        sulfate                                                                        [Bis(2-methylphenyl)-                                                                         13.0    1.44        0.88                                        phenyl]phosphinimide                                                           sulfate                                                                        ______________________________________                                    

The effect of (triphenylphospharnylidene)carbamic acid, ethyl ester on cardiac contractility was determined by the following test.

Isolated rat hearts were prepared and perfused essentially as described by Neely and Rovetto, Techniques for perfusing isolated rat hearts., in Methods of Enzymology, 24, part D, 43-60 (1975), J. G. Hardman and B. W. O'Malley (eds.), Academic Press, New York, N.Y. The hearts were cooled in ice cold saline and transferred to a Langendorff apparatus and perfused in a retrograde fashion with oxygenated Krebs-Henseleit buffer at 37° C. A 2-0 silk thread was secured to the left ventricular apex and run via pulleys to a force displacement transducer (Grass Instrument Co., model FT03C). Force of contraction (F), the first derivative of force with respect to time (dF/dt), and rate of cardiac contraction (HR) were monitored on a polygraph recorder (Grass Instrument Co., model 7D).

The perfusion medium was a modified Krebs-Henseleit buffer of the following composition:

    ______________________________________                                         Sodium chloride         119 mM                                                 Potassium chloride      4.7 mM                                                 Calcium chloride        2.54 mM                                                Monobasic sodium phosphate                                                                             1.19 mM                                                Magnesium sulfate       1.19 mM                                                Glucose                 5.5 mM                                                 Sodium bicarbonate      25 mM                                                  ______________________________________                                    

This medium was equilibrated with 95% oxygen:5% carbon dioxide at 37° C.

(Triphenylphosphoranylidene)carbamic acid, ethyl ester was dissolved in absolute ethanol at a concentration of 10 mg/ml and then diluted with Krebs-Henseleit buffer to the required stock concentration. The stock solution was infused at a constant rate by a syringe pump into the flow of buffer presented to the isolated heart at a rate necessary to achieve the desired final concentration. The results of this test appear in Table IV.

                                      TABLE IV                                     __________________________________________________________________________     Cardiodynamic Effects of (Triphenylphosphoranylidene)-                         carbamic Acid, Ethyl Ester in the Isolated Perfused                            Rat Heart Preparation                                                          Final Drug                                                                             No. of                                                                             Concentration                                                      Concentration                                                                          Rat Force (g)                                                                               dF/dt(g/sec)                                                                            HR                                               (mg/liter)                                                                             Hearts                                                                             (mean % change)                                                                         (mean % change)                                                                         (mean % change)                                  __________________________________________________________________________     1       7    5        6       -3                                               4       6   18       16       -2                                               8       5   24       21       -2                                               __________________________________________________________________________

The same effect has been achieved in anesthetized dogs by the intravenous administration of (triphenylphospharanylidene)carbamic acid, ethyl ester.

The compounds of the present invention have been found to be highly useful for lowering plasma renin activity, as diuretics and as cardiotonic agents in mammals when administered in amounts ranging from about 1.0 mg to about 50.0 mg/kg of body weight per day. A preferred dosage regimen for optimum results would be from about 3.0 mg to about 20.0 mg/kg of body weight per day. Such dosage units are employed that a total of from about 200 mg to about 1400 mg of active compound for a subject of about 70 kg of body weight are administered in a 24 hour period. This dosage regimen may be adjusted to provide the optimum therapeutic response. For example, several divided doses may be administered daily or the dose may be proportionally reduced as indicated by the exigencies of the therapeutic situation. The compounds of this invention are preferably administered orally but may be administered in any convenient manner such as by the intravenous, intramuscular or subcutaneous routes, in appropriate quantities.

The active compounds of the present invention may be orally administered, for example, with an inert diluent or with an assimilable edible carrier, or they may be enclosed in hard or soft shell gelatin capsules, or they may be compressed into tablets, or they may be incorporated directly with the food of the diet. For oral therapeutic administration, the active compounds may be incorporated with excipients and used in the form of tablets, troches, capsules, elixirs, suspensions, syrups, wafers, and the like. Such compositions and preparations should contain at least 0.1% of active compound. The percentage of the compositions and preparations may, of course, be varied and may conveniently be between about 2% to about 60% of the weight of the unit. The amount of active compound in such therapeutically useful compositions is such that a suitable dosage will be obtained.

The tablets, troches, pills, capsules and the like may also contain the following: A binder such as gum tragacanth, acacia, corn starch or gelatin; excipients such as dicalcium phosphate; a disintegrating agent such as corn starch, potato starch, alginic acid and the like; a lubricant such as magnesium stearate; and a sweetening agent such as sucrose, lactose or saccharin may be added or a flavoring agent such as peppermint, oil of wintergreen, or cherry flavoring. When the dosage unit form is a capsule, it may contain, in addition to materials of the above type, a liquid carrier such as a fatty oil. Various other materials may be present as coatings or to otherwise modify the physical form of the dosage unit. For instance, tablets, pills, or capsules may be coated with shellac, sugar or both. A syrup or elixir may contain the active compound, sucrose as a sweetening agent, methyl and propyl parabens as preservatives, a dye and flavoring such as cherry or orange flavor. Of course, any material used in preparing these dosage forms must be pharmaceutically pure and non-toxic.

The invention will be described in greater detail in conjunction with the following non-limiting examples.

EXAMPLE 1 (Triphenylphosphoranylidene)carbamic acid, ethyl ester

A 26.0 g portion of ethyl carbazate was dissolved in 150 ml of ice/water and 25 ml of concentrated hydrochloric acid and stirred with ice bath cooling as 18 g of sodium nitrite in 50 ml of water was added dropwise during 20 minutes. This mixture was stirred in an ice bath for 2 hours then extracted with 250 ml of dichloromethane. The organic layer was separated, dried over magnesium sulfate and evaporated in vacuo at 30° C. to yield ethyl carbonazidate as a mobile liquid. This liquid was dissolved in 100 ml of ether, filtered and the filtrate added to a filtered solution of 66 g of triphenylphosphine in 400 ml of ether. This mixture was stirred vigorously (gas evolution) for one hour. The precipitate was collected, washed with ether and dried, giving 50.8 g of the desired literature product, mp. 135°-137° C.

EXAMPLE 2 (Triphenylphosphoranylidene)carbamic acid, methyl ester

The subject compound was prepared by the procedure of Example 1, using methyl carbonazidate in place of ethyl carbonazidate. It melted at 138°-139° C.

EXAMPLE 3 (Triphenylphosphoaranylidene)carbamic acid, n-propyl ester

A 12.2 g portion of n-propyl chloroformate in 150 ml of acetonitrile was stirred at 5°-10° C. as 7.0 g of sodium azide was added. This mixture was stirred for 18 hours and then filtered. The filtrate containing the n-propyl carbonazidate was stirred as a filtered solution of 24 g of triphenylphosphine in 200 ml of ether was added. This solution was stirred for 2 hours (gas evolution), then evaporated to an oil in vacuo at 30° C. This oil was stirred with 200 ml of ether for 1/2 hour; the crystalline product was collected, washed with two 75 ml portions of ether and dried, giving 14.1 g of the desired product, mp 90°-91° C.

EXAMPLE 4 (Triphenylphosphoranylidene)carbamic acid, tetrahydro-3-furanyl ester

A 4.4 g portion of 3-hydroxytetrahydrofuran was dissolved in 200 ml of dry acetonitrile. The solution was stirred as 100 mg of 50% sodium hydride in oil was added. This mixture was stirred until gas evolution ceased, then 8.1 g of carbonyldiimidazole was added. The mixture was stirred at room temperature for 3 hours. A solution of 1.8 g of 95% hydrazine in 100 ml of acetonitrile was prepared, dried over magnesium sulfate and added to the above solution of tetrahydro-3-furanyl 1-imidazole carboxylate, which was then stirred at room temperature overnight. This mixture was evaporated in vacuo at 40° C. to a glassy residue containing tetrahydro-3-furanyl carbonazidate. This solid was dissolved in a mixture of 150 ml of water and 15 ml of concentrated hydrochloric acid, cooled to 0±2° C. and stirred as a solution of 4 g of sodium nitrite in 50 ml of water was added dropwise. This mixture was stirred for 30 minutes at 0°-5° C. after addition was complete and then extracted with 150 ml of ether. The ether extract containing tetrahydro-3-furanyl carbonazidate was washed with 75 ml of saturated aqueous sodium bicarbonate, dried over magnesium sulfate and then added to a filtered solution of 13 g of triphenylphosphine in 150 ml of ether, with stirring (gas evolution). The mixture was stirred for 2 hours at room temperature, then the precipitate was collected, washed with 100 ml of ether and dried in vacuo at 60° C., giving 7.0 g of the desired product, mp 130°-131° C.

Following the general procedure of Example 4, using the indicated starting materials, the products of Examples 5-7, found in Table V, were prepared.

                  TABLE V                                                          ______________________________________                                         Ex.   Starting Material                                                                           Product         MP° C.                               ______________________________________                                         5     2-propen-1-ol                                                                               (triphenylphosphoranyli-                                                                       108-109                                                        dene)carbamic acid, 2-                                                         propenyl ester                                              6     cyclopentanol                                                                               (triphenylphosphoranyli-                                                                       126-127                                                        dene)carbamic acid,                                                            cyclopentyl ester                                           7     4-oxopentan-1-ol                                                                            (triphenylphosphoranyli-                                                                       73-75                                                          dene)carbamic acid, 4-                                                         oxo-pentan-1-yl ester                                       ______________________________________                                    

EXAMPLE 8 (Triphenylphosphoranylidene)carbamic acid, cyclopropylmethyl ester

A mixture consisting of 0.75 g of cyclopropylmethanol, 0.48 g of 50% sodium hydride in mineral oil, and 50 ml of 1,2-dimethoxythane was stirred at room temperature for a few minutes, and then treated with 3.7 g of N-(triphenylphosphoranylidene)-1H-imidazole-1-carboxamide.

The reaction mixture was stirred under reflux conditions for 6 hours, and then poured into 300 ml of ice-water. The precipitate was collected, washed with water, and dried in vacuo over phosphorus pentoxide at room temperature. Thin-layer chromatographic studies indicated that a single compound was present, but recrystallization from diethyl ether was also useful. A yield of 3.2 g of the desired compound was obtained, mp 107°-113° C.

Following the general procedure of Example 8, using other starting materials in place of cyclopropylmethanol, the products of Examples 9-26 were obtained. In a few cases, preliminary purification by chromatography on silica gel, using a mixture of hexane and ethyl acetate as a developing solvent, was employed.

                  TABLE VI                                                         ______________________________________                                         Ex.   Starting Material                                                                            Product         MP °C.                              ______________________________________                                          9    trans-2-methyl-                                                                              (triphenylphosphoranyli-                                                                       101-109                                          cyclopentanol dene)carbamic acid,                                                            trans-2-methylcyclopentyl                                                      ester                                                      10    2-propyn-1-ol (triphenylphosphoranyli-                                                                       103-106                                                        dene)carbamic acid, 2-                                                         propynyl ester                                             11    1-ethylcyclopent-                                                                            (triphenylphosphoranyli-                                                                       84-90                                            anol          dene)carbamic acid, 1-                                                         ethylcyclopentyl ester                                     12    2,3-dihydro-  (triphenylphosphoranyli-                                                                       124-128                                          1 .sub.--H--inden-1-ol                                                                       dene)carbamic acid,                                                            1,2,3-dihydro-1 .sub.--H--inden-                                               1-yl ester                                                 13    trans-2-methoxy-                                                                             (triphenylphosphoranyli-                                                                        95-101                                          cyclopentanol dene)carbamic acid,                                                            trans-2-methoxycyclo-                                                          pentyl ester                                               14    2-butyne-1-ol (triphenylphosphoranyli-                                                                       125-129                                                        dene)carbamic acid, 2-                                                         butynyl ester                                              15    1-cyclopropyl-                                                                               (triphenylphosphoranyli-                                                                       79-84                                            ethanol       dene)carbamic acid, 1-                                                         cyclopropylethyl ester                                     16    2-cyclopenten-1-ol                                                                           (triphenylphosphoranyli-                                                                       110-114                                                        dene)carbamic acid, 2-                                                         cyclopenten-1-yl ester                                     17    trans-2-ethoxy-                                                                              (triphenylphosphoranyli-                                                                       116-118                                          cyclopentanol dene)carbamic acid,                                                            trans-2-ethoxycyclo-                                                           pentyl ester                                               18    1-propylcyclopent-                                                                           (triphenylphosphoranyli-                                                                       107-114                                          anol          dene)carbamic acid, 1-                                                         propylcyclopentyl ester                                    19    2-methylcyclopro-                                                                            (triphenylphosphoranyli-                                                                       91-94                                            panemethanol  dene)carbamic acid, (2-                                                        methylcyclopropyl)-                                                            methyl ester                                               20    tetrahydro-   (triphenylphosphoranyli-                                                                       138-142                                          2 .sub.--H--pyran-4-ol                                                                       dene)carbamic acid,                                                            tetrahydro-2 .sub.--H--pyran-                                                  4-yl ester                                                 21    cis and trans-2-                                                                             (triphenylphosphoranyli-                                                                       92-98                                            methoxycyclohexanol                                                                          dene)carbamic acid, cis-                                                       and trans-2-methoxy-                                                           cyclohexyl ester                                           22    trans-2-methoxy-                                                                             (triphenylphosphoranyli-                                                                        98-100                                          cyclohexanol  dene)carbamic acid,                                                            trans-2-methoxycyclo-                                                          hexyl ester                                                23    2-pyridinylmethanol                                                                          (triphenylphosphoranyli-                                                                       86-88                                                          dene)carbamic acid, 2-                                                         pyridinylmethyl ester                                      24    4-pyridinylmethanol                                                                          (triphenylphosphoranyli-                                                                       150-152                                                        dene)carbamic acid, 4-                                                         pyridinylmethyl ester                                      25    3-pyridinylmethanol                                                                          (triphenylphosphoranyli-                                                                       108-110                                                        dene)carbamic acid, 3-                                                         pyridinylmethyl ester                                      26    dicyclopropyl-                                                                               (triphenylphosphoranyli-                                                                       129-133                                          methanol      dene)carbamic acid,                                                            dicyclopropylmethyl                                                            ester                                                      ______________________________________                                    

EXAMPLE 27 [(2-Methylphenyl)diphenylphosphoranylidene]carbamic acid, 3-pyridinylmethyl ester

A mixture of 9.2 g of diphenyl(2-methylphenyl)phosphine in 65 ml of methanol was heated to solution on a steam bath, then cooled to room temperature. Over 5 minutes, a solution of 3.76 g of hydroxylamine-O-sulfonic acid in 24 ml of methanol was added. The mixture was filtered into 400 ml of ether and the solid collected giving 8.40 g of P-(2-methylphenyl)-P,P-diphenylphosphine imide, sulfate salt.

The 8.40 g of the above compound was reacted with triethylamine and carbonyldiimidazole in tetrahydrofuran as described in Example 8, giving 5.35 g of 1-[[[(2-methylphenyl)diphenylphosphoranylidene]amino]carbonyl]-1H-imidazole.

A 760 mg portion of 3-pyridinemethanol, 35 ml of 1,2-dimethoxyethane, 340 mg of 50% sodium hydride in oil and 2.7 g of 1-[[[(2-methylphenyl)diphenylphosphoranylidene]amino]carbonyl]-1H-imidazole were reacted as described in Example 8, giving 2.05 g of the desired product, mp 142°-143° C.

Following the procedure of Example 27, using starting materials other than 3-pyridinemethanol, the products of Examples 28-30, foumd in Table VII, were obtained.

                  TABLE VII                                                        ______________________________________                                         Ex.  Starting Material                                                                            Product          MP °C.                              ______________________________________                                         28   cyclopropyl-  [(2-methylphenyl)diphen-                                                                        110-112                                         methanol      ylphosphoranylidene]car-                                                       bamic acid, cyclopropyl-                                                       methyl ester                                                29   cyclopentanol [(2-methylphenyl)diphen-                                                                        166-168                                                       ylphosphoranylidene]car-                                                       bamic acid, cyclopentyl                                                        ester                                                       30   2-propyn-1-ol [(2-methylphenyl)diphen-                                                                        112-115                                                       ylphosphoranylidene]car-                                                       bamic acid, 2-propyn-1-                                                        ol ester                                                    ______________________________________                                    

EXAMPLE 31 [(2-Methoxyphenyl)diphenylphosphoranylidene]carbamic acid, ethyl ester

A 1.0 g portion of (2-methoxyphenyl)diphenylphosphine was added to 30 ml of ether and stirred. The mixture was filtered and to the filtrate was added 3.6 ml of 1M ethyl carbonazidate in ether. This mixture was repeatedly concentrated, treated with fresh ether and refrigerated, giving 400 mg of the desired product, mp 80°-83° C.

EXAMPLE 32 [(2-Methylphenyl)diphenylphosphoranylidene]carbamic acid, tetrahydro-3-furanyl ester

A 2.76 g portion of (2-methylphenyl)diphenylphosphine was stirred in 60 ml of ether, then treated with charcoal and filtered. To the filtrate was added a solution of 1.7 g tetrahydro-3-furanyl carbonazidate in 60 ml of ether. After standing 8 hours the solid was collected, washed with ether and dried, giving 2.3 g of the desired product, mp 118°-119° C.

EXAMPLE 33 [(2-Methylphenyl)diphenylphosphoranylidene]carbamic acid, ethyl ester

A solution of 1.0 g of (2-methylphenyl)diphenylphosphine in 30 ml of ether was treated with 4 ml of 1M ethyl carbonazidate in ether. The mixture was allowed to stand 48 hours, then repeatedly concentrated and finally treated with fresh ether and refrigerated, giving 930 mg of the desired compound, mp 113°-114° C.

Following the procedure of Example 33, using the indicated phosphine and carbonazidate derivatives, the products of Examples 34-57, found in Table VIII were obtained.

                                      TABLE VIII                                   __________________________________________________________________________                   --Carbon-                                                        Ex.                                                                               --Phosphine                                                                               azidate                                                                               Product             MP °C.                         __________________________________________________________________________     34 [2-(trifluoromethyl)-                                                                     ethyl- [diphenyl[2-(trifluoromethyl)phenyl]-                                                              glass                                    phenyl]diphenyl-  phosphoranylidene]carbamic acid, ethyl                                         ester                                                     35 [2-(trifluoromethyl)-                                                                     methyl-                                                                               [diphenyl[2-(trifluoromethyl)phenyl]                                                               135-140                                  phenyl]diphenyl-  phosphoranylidene]carbamic acid, methyl                                        ester                                                     36 [2-(trifluoromethyl)-                                                                     tetrahydro-3-                                                                         [diphenyl[2-(trifluoromethyl)phenyl]-                                                              102-104                                  phenyl]diphenyl-                                                                          furanyl-                                                                              phosphoranylidene]carbamic acid, tetra-                                        hydro-3-furanyl ester                                     37 (2-ethylphenyl)-                                                                          methyl-                                                                               [(2-ethylphenyl)diphenylphosphoranyli-                                                             121-122                                  diphenyl-         dene]carbamic acid, methyl ester                          38 (2,6-dimethylphenyl)-                                                                     methyl-                                                                               [(2,6-dimethylphenyl)diphenylphosphor-                                                             149-151                                  diphenyl-         anylidene]carbamic acid, methyl ester                     39 (2-methylphenyl)-                                                                         methyl-                                                                               [(2-methylphenyl)diphenylphosphoranyli-                                                            139-142                                  diphenyl-         dene]carbamic acid, methyl ester                          40 (2-chlorophenyl)-                                                                         ethyl- [(2-chlorophenyl)diphenylphosphoranyli-                                                            110-112                                  diphenyl-         dene]carbamic acid, ethyl ester                                                                    (dec.)                                41 (2-chlorophenyl)-                                                                         tetrahydro-3-                                                                         [(2-chlorophenyl)diphenylphosphoranyli-                                                            118-120                                  diphenyl-  furanyl-                                                                              dene]carbamic acid, tetrahydro-3-                                                                  (dec.)                                                     furanyl ester                                             42 (3-chlorophenyl)-                                                                         ethyl- [(3-chlorophenyl)diphenylphosphoranyli-                                                            103-107                                  diphenyl-         dene]carbamic acid, ethyl ester                           43 (3-chlorophenyl)-                                                                         methyl-                                                                               [(3-chlorophenyl)diphenylphosphoranyli-                                                            99.5-100                                 diphenyl-         dene]carbamic acid, methyl ester                                                                   (dec.)                                44 bis(2-chlorophenyl)-                                                                      ethyl- [bis(2-chlorophenyl)phenylphosphoran-                                                              144-146                                  phenyl-           ylidene]carbamic acid, ethyl ester                        45 (2-chlorophenyl)-                                                                         methyl-                                                                               [(2-chlorophenyl)diphenylphosphoranyli-                                                            140-144                                  diphenyl-         dene]carbamic acid, methyl ester                          46 bis(2-methylphenyl)-                                                                      ethyl- [bis(2-methylphenyl)phenylphosphoran-                                                              130-133                                  phenyl-           ylidene]carbamic acid, ethyl ester                        47 [(2,6-dimethylphen-                                                                       ethyl- [[(2,6-dimethylphenyl)diphenyl]phos-                                                               119-120                                  yl)diphenyl]-     phoranylidene]carbamic acid, ethyl                                             ester                                                     48 (2-bromophenyl)-                                                                          ethyl- [(2-bromophenyl)diphenylphosphoranyli-                                                             113-114                                  diphenyl-         dene]carbamic acid, ethyl ester                           49 (3-fluorophenyl)-                                                                         ethyl- [[(3-fluorophenyl)diphenylphosphoran-                                                              112-115                                  diphenyl-         ylidene]carbamic acid, ethyl ester                        50 (2-ethylphenyl)-                                                                          ethyl- [(2-ethylphenyl)diphenylphosphoranyli-                                                             87-89                                    diphenyl-         dene]carbamic acid, ethyl ester                           51 bis(3-chlorophenyl)-                                                                      ethyl- [[bis(3-chlorophenyl)phenyl]phosphoran-                                                            108-109                                  phenyl-           ylidene]carbamic acid, ethyl ester                        52 (3-trifluoromethyl)-                                                                      ethyl- [(3-trifluorophenyl)diphenylphosphoran-                                                            85-87                                    phenyl-diphenyl-  ylidene]carbamic acid, ethyl ester                        53 (2,3-dichlorophenyl)-                                                                     ethyl- [(2,3-dichlorophenyl)diphenylphosphor-                                                             134-136                                  diphenyl-         anylidene]carbamic acid ethyl ester                       54 Diphenyl(2-fluoro-                                                                        ethyl- [Diphenyl(2-fluorophenyl)phosphoranyli-                                                            106-108                                  phenyl)-          dene]carbamic acid, ethyl ester                           55 2-[(1-Methylethyl)-                                                                       ethyl- [[2-(1-Methylethyl)phenyl]diphenylphos-                                                            134-136                                  phenyl]diphenyl-  phoranylidene]carbamic acid, ethyl ester                  56 (3-Bromophenyl)di-                                                                        ethyl- [(3-Bromophenyl)diphenylphosphoranyli-                                                             123-124                                  phenyl-           dene]carbamic acid, ethyl ester                           57 [Bis(2-methylphenyl-                                                                      methyl-                                                                               [Bis(2-methylphenyl)phenylphosphoranyli-                                                           140-142                                  phenyl-           dene]carbamic acid, methyl ester                          __________________________________________________________________________

EXAMPLE 58 (2-Methylphenyl)diphenylphosphinimide sulfate

Five grams of (2-methylphenyl)diphenylphosphine was dissolved in 35 ml of methanol by warming. Cooling to room temperature gave a suspension which was treated with a solution of 2 g of O-hydroxylaminesulfonic acid in 13 ml of methanol. A slight exothermic reaction resulted, the temperature rising from 22° C. to 29° C. during twenty minutes. After returning to room temperature, the reaction mixture was filtered into 220 ml of diethyl ether (vigorous stirring), resulting in the formation of a crystalline precipitate. This was filtered off, washed with diethyl ether, and dried, giving 3.4 g of the desired compound, mp 194°-196° C.

EXAMPLE 59 Triphenylphosphinimide sulfate

The subject compound was prepared by the procedure of Example 58, triphenylphosphine replacing the (2-methylphenyl)diphenylphosphine. It melted at 184°-190° C. with decomposition.

EXAMPLE 60 [Bis(2-methylphenyl)phenyl]phosphinimide sulfate

The subject compound was prepared by the procedure of Example 58, bis(2-methylphenyl)phenylphosphine relacing the (2-methylphenyl)diphenylphosphine. It melted at 194°-196° C.

EXAMPLE 61 Preparation of Compressed Tablet

    ______________________________________                                         Ingredient          mg/Tablet                                                  ______________________________________                                         (Triphenylphosphoranylidene-                                                                       5-100                                                      carbamic acid, ethyl ester                                                     Dibasic Calcium Phosphate NF                                                                       qs                                                         Starch USP          40                                                         Modified Starch     10                                                         Magnesium Stearate USP                                                                             1-5                                                        ______________________________________                                    

EXAMPLE 62 Preparation of Hard Shell Capsule

    ______________________________________                                         Ingredient          mg/Capsule                                                 ______________________________________                                         (Triphenylphosphoranylidene)-                                                                      5-100                                                      carbamic acid, methyl ester                                                    Lactose, Spray Dried                                                                               qs                                                         Magnesium Stearate  1-10                                                       ______________________________________                                    

EXAMPLE 63 Intravenous Solutions

An organic such as citric, succinic, tartaric or mixtures thereof is dissolved in water at a concentration of 0.1-0.75%. (Triphenylphosphoranylidene)carbamic acid, ethyl ester is dissolved in the acid-water mixture providing a clear solution which, after sterilization, is suitable for intravenous administration.

EXAMPLE 64 Intramuscular Preparations

(Triphenylphosphoranylidene)carbamic acid, ethyl ester is dissolved in one of the following solvents or cosolvents and then sterilized, providing solutions for intramuscular administration.

    ______________________________________                                         Benzyl alcohol                                                                 Olive oil                                                                      Peanut oil                                                                     Propylene glycol/water                                                                              20-80%                                                    Polyethylene glycol 300/water                                                                       20-100%                                                   Polyethylene glycol 400/water                                                                       20-100%                                                   Polyethylene glycol 4000/water                                                                      0.2-0.5%                                                  Ethanol/water        20-50%                                                    ______________________________________                                    

EXAMPLE 65 Oral Preparations

(Triphenylphosphoranylidene)carbamic acid, ethyl ester is dissolved in one of the following systems providing solutions or suspensions for oral administration.

    ______________________________________                                         Sodium lauryl sulfate/water                                                                         0.5-3%                                                    Polysorbate 80/water 0.5-5%                                                    Polysorbate 40/water  0.01-0.75%                                               Polysorbate 20/water 0.005-0.02%                                               Polyoxyethylene lauryl ether/water                                                                  0.5-4%                                                    Polyoxyethylene stearyl ether/water                                                                 0.5-4%                                                    Polyoxyethylene oleyl ether/water                                                                   0.5-4%                                                    ______________________________________                                    

EXAMPLE 66 Oral Suspension

The following formulation provides an acceptable oral suspension.

    ______________________________________                                         (Triphenylphosphoranylidene)-                                                                       1-5%                                                      carbamic acid, ethyl ester                                                     Veegum               0.1-2.0%                                                  Methyl paraben       0.08%                                                     Propyl paraben       0.02%                                                     Sucrose/Sorbitol     20-80%                                                    Flavor               qs                                                        Water qs to          100%                                                      ______________________________________                                     

What is claimed is:
 1. A compound selected from those of the formula: ##STR12## wherein R₁, R₂ and R₃ are each at the ortho or meta position, represent mono- or disubstituents selected from the group consisting of hydrogen, alkyl(C₁ -C₃), alkoxy(C₁ -C₃), trifluoromethyl and halogen; and R₄ is selected from the group consisting of alkyl(C₁ -C₃), alkenyl(C₂ -C₃), alkynyl(C₂ -C₄), cycloalkyl(C₃ -C₅), cycloalkyl(C₃ -C₆)methyl, 4-oxopentyl, 2,3-dihydro-1H-inden-1-yl, 1-alkyl(C₁ -C₃)cyclopentyl, trans-2-alkyl(C₁ -C₃)cyclopentyl, trans-2-alkoxy(C₁ -C₃)cyclopentyl, 1-cyclopropylethyl, 2-methylcyclopropylmethyl, dicyclopropylmethyl, 2-cyclopenten-1-yl, and cis and trans-2-methoxycyclohexyl; with the proviso that when R₄ is alkyl(C₁ -C₃), two of R₁, R₂ and R₃ are not hydrogen.
 2. A compound according to claim 1, wherein R₄ is methyl, ethyl, or cyclopropylmethyl.
 3. A compound according to claim 2, wherein R₁ is 3-chloro.
 4. The compound according to claim 2, [[bis(3-chlorophenyl)phenyl]phosphoranylidene]carbamic acid, ethyl ester.
 5. A compound according to claim 2, wherein R₁ and R₂ are the same and are 2-methyl or 2-chloro and R₃ is hydrogen.
 6. A compound according to claim 5 which is:[bis(2-chlorophenyl)phenylphosphoranylidene]carbamic acid, ethyl ester; or [bis(2-methylphenyl)phenylphosphoranylidene]carbamic acid, methyl ester.
 7. A compound according to claim 1, which is[(2-methylphenyl)diphenylphosphoranylidene]carbamic acid, tetrahydro-3-furanyl ester.
 8. A compound according to claim 2 (triphenylphosphoranylidene)carbamic acid, cyclopropylmethyl ester.
 9. The compound according to claim 1, (triphenylphosphoranylidene)carbamic acid, 2-propynyl ester.
 10. A method for effecting diuresis in a mammal which comprises administering to said mammal a diuretic effective amount of a compound selected from those of the formula: ##STR13## wherein R₁, R₂ and R₃ are each at the ortho or meta position, represent mono- or disubstituents selected from the group consisting of hydrogen, alkyl(C₁ -C₃), alkoxy(C₁ -C₃), trifluoromethyl and halogen; and R₄ is selected from the group consisting of alkyl(C₁ -C₃), alkenyl(C₂ -C₃), alkynyl(C₂ -C₄), cycloalkyl(C₃ -C₅), cycloalkyl(C₃ -C₆)methyl, 4-oxopentyl, 2,3-dihydro-1H-iden-1-yl, 1-alkyl(C₁ -C₃)cyclopentyl, trans-2-alkyl(C₁ -C₃)cyclopentyl, trans-2-alkoxy(C₁ -C₃)cyclopentyl, 1-cyclopropylethyl, 2-methylcyclopropylmethyl, dicyclopropylmethyl, 2-cyclopenten-1-yl, and cis and trans-2-methoxycyclohexyl.
 11. A method for lowering plasma renin activity in a mammal which comprises administering to said mammal a plasma renin lowering effective amount of a compound selected from those of the formula: ##STR14## wherein R₁, R₂ and R₃ are each at the ortho or meta position, represent mono- or disubstituents selected from the group consisting of hydrogen, alkyl(C₁ -C₃), alkoxy(C₁ -C₃), trifluoromethyl and halogen; and R₄ is selected from the group consisting of alkyl(C₁ -C₃), alkenyl(C₂ -C₃), alkynyl(C₂ -C₄), cycloalkyl(C₃ -C₅), cycloalkyl(C₃ -C₆)methyl, 4-oxopentyl, 2,3-dihydro-1H-iden-1-yl, 1-alkyl(C₁ -C₃)cyclopentyl, trans-2-alkyl(C₁ -C₃)cyclopentyl, trans-2-alkoxy(C₁ -C₃)cyclopentyl, 1-cyclopropylethyl, 2-methylcyclopropylmethyl, dicyclopropylmethyl, 2-cyclopenten-1-yl, and cis and trans-2-methoxycyclohexyl.
 12. A method for increasing cardiac contractility in a mammal which comprises administering to said mammal a cardiotonicity-potentiating effective amount of a compound selected from those of the formula: ##STR15## wherein R₁, R₂, and R₃ are each at the ortho or metal position, represent mono- or disubstituents selected from the group consisting of hydrogen, alkyl(C₁ -C₃), alkoxy(C₁ -C₃), trifluoromethyl and halogen; and R₄ is selected from the group consisting of alkyl(C₁ -C₃), alkenyl(C₂ -C₃), alkynyl(C₂ -C₄), cycloalkyl(C₃ -C₅), cycloalkyl(C₃ -C₆)methyl, 4-oxopentyl, 2,3-dihydro-1H-iden-1-yl, 1-alkyl(C₁ -C₃)cyclopentyl, trans-2-alkyl(C₁ -C₃)cyclopentyl, trans-2-alkoxy(C₁ -C₃)cyclopentyl, 1-cyclopropylethyl, 2-methylcyclopropylmethyl, dicyclopropylmethyl, 2-cyclopenten-1-yl, and cis and trans-2-methoxycyclohexyl.
 13. A pharmaceutical composition of matter in dosage unit form comprising an effective amount of a compound selected from those of the formula: ##STR16## wherein R₁, R₂ and R₃ are each at the ortho or meta position, represent mono- or disubstituents selected from the group consisting of hydrogen, alkyl(C₁ -C₃), alkoxy(C₁ -C₃), trifluoromethyl and halogen; and R₄ is selected from the group consisting of alkyl(C₁ -C₃), alkenyl(C₂ -C₃), alkynyl(C₂ -C₄), cycloalkyl(C₃ -C₅), cycloalkyl(C₃ -C₆)methyl, 4-oxopentyl, 2,3-dihydro-1H-inden-1-yl, 1-alkyl(C₁ -C₃)cyclopentyl, trans-2-alkyl(C₁ -C₃)cyclopentyl, trans-2-alkoxy(C₁ -C₃)cyclopentyl, 1-cyclopropylethyl, 2-methylcyclopropylmethyl, dicyclopropylmethyl, 2-cyclopenten-1-yl, and cis and trans-2-methoxycyclohexyl with a proviso that when R₄ is alkyl(C₁ -C₃), two of R₁, R₂ and R₃ are not hydrogen in association with a pharmaceutically acceptable carrier. 